I worked at Adnexus, a Bristol-Myers Squibb R&D Co. as a contractor (less than a year)

Pros

In short, this place cares about you as a person. Period. The people are incredibly nice, the atmosphere is relaxed, and there are so many great little perks. Food is plentiful. Lots of team events. Overall just a positive vibe.

Cons

On the way out, Bristol-Myers had started to apply their own internal politics to the scene. This led to many people getting let go that really brought the place to life. In addition, as a contractor looking to go perm, it became clear a few months in that going full-time would never happen which what sealed my fate there.